Here's my stats, should I postpone?

I've been studying for the summer, mainly using EK with some KA and Kaplan mixed in. My GPA ended up around a 3.5 as I had around 3.0 after Sophomore year when I switched to Bio from Engineering, so my final 2 years were around 3.8. But since my GPA isn't that impressive, I figure I have to compensate with a great MCAT. My test in scheduled for August 25th, I'm debating switching my date to September 10th for a few more days of full lengths.

My FL's have been:

Kaplan 1: 505
Che/Phy: 124...

Here's my stats, should I postpone?